I miss my car!
It's now been 8 weeks, and ATS in the US are still waiting for the pistons to arrive so they can ship everything over.
I've been talking to Advance in the mean time, and it's likely that I'm going to proceed with twin in-tank staged fuel pumps, so I can have a good safety buffer rather than using up all of the available flow with my power level on a single Walbro E85 pump.
I'd like to upgrade the fuel return line to at least -6AN braided teflon hose (instead of the small stock return hard line on top of the tank), which will require the tank to come out anyway...hopefully for the final time!
I came up with my own custom strategy for controlling both fuel pumps, and I implemented it in my ECU last night in preparation. Here's how it will work:
- Each fuel pump will have its own relay controlled by separate ECU outputs
- Only 1 of the 2 pumps will run most of the time, until the flow of both pumps is required
- Every 5 minutes, the ECU will swap to the opposite fuel pump (but it will only do this in the over-run fuel-cut condition, so I won't feel it at all)
- By alternating the pumps periodically during cruise conditions or idle, I'm more likely to know if either of the pumps has a problem before the next time I intend to use all of the engine's power, in which case both pumps will need to be working correctly to achieve the expected fuel delivery
- Rather than having only a boost threshold setting for turning on both pumps, I thought it would be more ideal to turn on both fuel pumps based on the actual injector fuel-flow requirement exceeding a configurable value (my ECU already knows the litres per hour of fuel required by the injectors at any time, so it makes sense to utilise this information instead of just the boost level)